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Seasonal biological variation in some leaf‐miner parasites in the genus Achrysocharoides (Hymenoptera, Eulophidae)
Author(s) -
BRYAN GEORGINA
Publication year - 1983
Publication title -
ecological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0307-6946
DOI - 10.1111/j.1365-2311.1983.tb00507.x
Subject(s) - eulophidae , biology , gracillariidae , lepidoptera genitalia , sex ratio , instar , brood , parasitism , hymenoptera , zoology , larva , ecology , parasitoid , host (biology) , population , demography , sociology
.1 Most Achrysocharoides species and their Phyllonorycter hosts (Lepidoptera, Gracillariidae) have two generations per year in Britain. 2 In those species with separate sex broods, peak male emergence tends to be earlier than peak female emergence. This female emergence lag is shorter in the second generation. 3 The mean brood size in the second generation is significantly smaller than in the first in A.cilla males and females, A.latreilli females, mixed sex broods of A.atys , and A.carpini females. A.cilla, A.latreilli and A.niveipes generally have a significantly greater proportion of males in the second generation, but A.atys does not. 4 There is a shift to killing later instar Phyllonorycter larvae in the second generation, when a much higher percentage parasitism is generally achieved. 5 The intergeneration differences in sex ratio and brood size may be explained by a change in oviposition behaviour of females of the first and second generations.